Computer Questions For Competitive Exams PDF Download
Computers Important Questions For Exams
History Of Computers Asked In IBPS SSC Exams–The word Computer in earlier times meant a person who performed calculations or computations. With years its definition changed to a machine that performs calculations. It can perform all type of mathematical and logical operations; it can accept data, store data, retrieve data, process data and produce output.Hope this computer knowledge questions and answers will help you in your exams and please share this computer questions for competitive exams pdf download topic by which other your friends will get the information about this topic.
Charles Babbage was known as the father of the computer. He invented two machines in 1822 introduced Difference Engine and in 1834, introduced Analytical engine
Generation of Computer
|Subject||1st generation||2nd generation||3rd generation||4th generation||5th generation|
|Period||1940-1956||1956-1963||1964-1971||1971-present||present & beyond|
|Circuitry||Vacuum tube||Transistor||Integrated chips (IC)||Microprocessor|
|ULSI (Ultra Large|
|Memory Capacity||20 KB||128KB||1MB||Semiconductor type and very high||VLSI and ULSI|
|Processing Speed||300 IPS inst. Per sec.||300 IPS||1MIPS(1 million inst. Per|
|Faster than 3rd|
|C,C++||C,C++,Java||All the Higher level languages,|
|Example of computers||UNIVAC, EDVAC||IBM 1401, IBM|
7094, CDC 3600,D UNIVAC 1108
|IBM 360 series,|
ENIAC was the first digital computer and it was invented by J.Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in 1943. It uses 18000 vacuum tubes as a storing device. They were also founders of the first computer company, it was initially named Electronic Controls Company which was later changed to Eckert–Mauchly Computer Corporation and released a series of mainframe electronic digital stored-program computer under the name of UNIVAC.
MIT introduces the whirlwind machine (first computer with(RAM) on March 8, 1955.
Classification Of Computers — computer knowledge questions and answersComputer Questions For Competitive Exams PDF Download
Analog computer introduced by Lord Kelvin. Numerical data are represented by measurable physical variables such as electrical voltage. A thermometer is a simple analog computer.
Digital computer that accepts and process data in the form of numbers and all the character are converted into binary
The hybrid computer used the combined feature of the analog and digital machine. you can see the hybrid computer in geological departments.
Microcomputer these are small relatively inexpensive computer designed for personal and office use. It has lowest
storing and processing speed. These can be laptop or desktop.
Minicomputer powerful as compare to microcomputer it
Has higher memory provide faster-operating speeds and large storage capacities than microcomputers. It can be used as a server and capable of supporting from 2 to 200 users. Mainframe computer it has very high memory and processing speed and used as a server (can support thousands of users)
The supercomputer can be used for a complex type of application i.e. specific research, weather forecasting, Weapon designing etc.
CDC 6600 was the first successful supercomputer.
Sunway TaihuLight of China is the fastest supercomputer in the world.
PARAM-8000 India’s first Super Computer developed by C-DAC Pune in 1998.
Shasra T is considered as India’s fastest supercomputer, manufactured by Indian Institute of Science.
Servers are dedicated computers that serve the needs or request of other programs or computer.
Workstations serve usually one user only.
Information appliances are computers specially designed to perform a specific “user-friendly” function—such as playing music, photography.
An embedded system is a computer system with a dedicated function within a larger system.Computer Questions For Competitive Exams PDF Download
Hardware and I/O Devices – Computers Important Questions For Exams
A computer is an electronic device that accepts data from the user (input), processes the data by performing calculations and operations on it and generates the desired Output.
An unprocessed collection or representation of raw facts represented in a manner suitable for communication, interpretation or processing by humans or by automatic means, is known as Data.
Personal computers use a number of chips mounted on a main circuit board called Motherboard. A motherboard is the physical arrangement in a computer that contains the computer’s basic circuitry and components.
An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) which converts the electronically generated information into human-readable form.
The CPU is fabricated as a single Integrated Circuit (IC) chip. It is also known as the Microprocessor. Multiprocessor Computers uses two or more central processing units (CPUs) within a single computer system. The term also refers to the ability of a system to support more than one processor and/or the ability to allocate tasks between them.
The central processing unit (CPU) is the brain of your computer. It handles all the instructions you give your computer. The control unit (CU) is a component of a computer’s central processing unit (CPU) that directs operation of the processor. It tells the computer’s memory, arithmetic/logic unit and input and output devices how to respond to a program’s instructions.
An arithmetic logic unit (ALU) is a digital circuit used to perform arithmetic and logic operations. It represents the fundamental building block of the central processing unit
(CPU) of a computer.
Instruction Execution: the program which is to be executed is a set of instruction which are stored in memory. The CPU executes the instructions of program to complete a task and this execution takes place inside the CPU with the help of registers ALU (arithmetic logic unit) and CU(control unit). When the processor executes instructions, data is temporarily stored in small local memory location and these are called registers.
Accumulator Register: – which stores the immediate result of arithmetic and logical operations.
Memory address register (MAR) : – which contain the address of memory location to which data is to be stored.
Program counter : – which contain the address of the next
instruction to process.
Instruction register: – which contain the current instruction being processed
A keyboard is a typewriter-style device, which uses an arrangement of buttons or keys, to act as mechanical levers or electronic switches. Most of the commonly available personal computers have a keyboard, popularly known as Qwerty.
|Toggle Keys||Caps Lock, Num Lock,|
|Modifier Keys||Shift, Alt, Ctrl, Fn|
|Alphanumeric Keys||A-Z, 0-9|
‘Caps lock’ and ‘Num lock’ keys are called as Toggle Keys because when pressed, they change their status from one state to another.
Numeric Keypad is a keypad located on the right hand side
of the keyboard. It consists of digits and mathematical operators.
A Modifier key is a special key (or combination) on a computer keyboard that temporarily modifies the normal action of another key when pressed together. By themselves, modifier keys usually do nothing; that is, pressing any of the Shift, Alt, or Ctrl keys alone does not (generally) trigger any action from the computer.
A Mouse is the most popular input device which is used today for interactive processing and for the one line entry of data for batch processing. The first computer mouse was invented by Douglas Engelbart.
Drag and Drop refers to the action of clicking and holding down the mouse button, while moving the mouse and then releasing the mouse button.
The data that is fed into a computer processor, received into the computer by a keyboard or other sources is called Input. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.
Joystick is the device that moves in all directions and controls the movement of a pointer.
A Touch Screen is a type of display screen device that is placed on the computer monitor to allow direct selection or activation of the computer when the user touches the screen. It acts as both input and output device.
Light Pen is the pen shaped device, which can sense light and is used to point at spots on a video screen.
A technology enables a high-speed reading of large quantities of data and transferring these data to the
computer without using a keyboard. It is referred as Optical Mark Reader (OMR). It uses a beam of light that is reflected on the paper with marks, to capture presence and absence of marks.
MICR reads the characters by examining their shapes in a matrix form and the information is then passed `on to the computer. MICR stands for Magnetic Ink Character Reader. It provides a high level of security and is therefore used by the banking industry for faster processing of the cheque.
Bar Code is a machine readable code, which is represented by parallel vertical lines with varying widths. For reading these bar-coded data, a device is used, which is known as a Bar Code Reader (BCR)
Optical Character Recognition (OCR) is used to scan the document containing text. It is the mechanical or electronic conversion of scanned or photographed images of typewritten or printed text into machine- encoded/computer-readable text.
Computers Important Questions For Exams
A point of sale terminal (POS terminal) is an electronic device used to process card payments at retail locations.
The device that prints information from the computer onto the paper is Printer.
The printed form of output is referred as Hard Copy. The form of output displayed on the screen is referred as Soft Copy.
Pages per Minute (PPM) is the unit used to count the speed of the printer.
On the basis of technology, printers are categorized into Impact and Non- Impact Printers.
Computer Questions For Competitive Exams PDF Download
Impact printers create an image by using some mechanism to physically press an inked ribbon against the page, causing the ink to be deposited on the page in the shape desired.
- I) Dot matrix : – The dot-matrix printer uses print heads containing from 9 to 24 pins. These pins produce patterns of dots on the paper to form the individual characters
- II) Daisy wheel: – A hammer strikes a “petal” containing a character against the ribbon, and the character prints on the paper. Its speed is slow typically 25-55 characters per secon
III) Line printer: – Line printers, or line-at-a-time printers, use special mechanism that can print a whole line at once; they can typically print the range of 1,200 to 6,000 lines per minute
- IV) Drum printer: – A drum printer consists of a solid, cylindrical drum that has raised characters in bands on its surface. The number of print positions across the drum equals the number available on the page.
- V) Chain printer: – A chain printer uses a chain of print characters wrapped around two pulleys
- VI) Band printer: – Band printer has a steel band divided into five sections of 48 characters eac
Non – Impact Printers do not touch the paper when creating an image.
- I) Ink-jet printers: – One or more nozzles in the print head emit a steady stream of ink dr Droplets of ink are electrically charged after leaving the nozzle. The droplets are then guided to the paper by electrically charged deflecting plates
- II) Laser printers: – Laser printers use buffers that store an entire page at a time. When a whole page is loaded, it will be printe
III)Thermal printer: – is a digital printing process which produces a printed image by selectively heating coated thermo chromic paper, or thermal paper as it is commonly known, when the paper passes over the thermal print head.
A plotter is an output device that interprets commands from a computer to make line drawings on paper with one or more automated pens. Unlike a regular printer, the plotter can draw continuous point-to-point lines directly from vector graphics files or commands.
An uninterruptible power supply (UPS) is a device that allows a computer to keep running for at least a short time when the primary power source is lost.
A Monitor is a TV-like display attached to the computer on which the output can be displayed and viewed. It can either be a monochrome display or a color display. The number of pixels displayed on a screen is known as Resolution.
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